Subtract two integers, checking for overflow. : Integer Data Type « Data Type « Java Tutorial

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3. Integer Data Type

import java.math.BigDecimal;

/* 
 * Licensed to the Apache Software Foundation (ASF) under one or more
 *  contributor license agreements.  See the NOTICE file distributed with
 *  this work for additional information regarding copyright ownership.
 *  The ASF licenses this file to You under the Apache License, Version 2.0
 *  (the "License"); you may not use this file except in compliance with
 *  the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 *
 *
 */
public class Main {

  /**
   * Subtract two integers, checking for overflow.
   * 
   * @param x the minuend
   * @param y the subtrahend
   * @return the difference <code>x-y</code>
   * @throws ArithmeticException if the result can not be represented as an
   *         int
   * @since 1.1
   */
  public static int subAndCheck(int x, int y) {
      long s = (long)x - (long)y;
      if (s < Integer.MIN_VALUE || s > Integer.MAX_VALUE) {
          throw new ArithmeticException("overflow: subtract");
      }
      return (int)s;
  }
}